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// Copyright 2006-2009 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "v8.h"
#include "bootstrapper.h"
#include "debug.h"
#include "serialize.h"
#include "stub-cache.h"
#include "oprofile-agent.h"
#if V8_TARGET_ARCH_ARM
#include "arm/simulator-arm.h"
#endif
namespace v8 {
namespace internal {
bool V8::is_running_ = false;
bool V8::has_been_setup_ = false;
bool V8::has_been_disposed_ = false;
bool V8::has_fatal_error_ = false;
bool V8::Initialize(Deserializer *des) {
bool create_heap_objects = des == NULL;
if (has_been_disposed_ || has_fatal_error_) return false;
if (IsRunning()) return true;
is_running_ = true;
has_been_setup_ = true;
has_fatal_error_ = false;
has_been_disposed_ = false;
#ifdef DEBUG
// The initialization process does not handle memory exhaustion.
DisallowAllocationFailure disallow_allocation_failure;
#endif
// Enable logging before setting up the heap
Logger::Setup();
if (des) des->GetLog();
// Setup the platform OS support.
OS::Setup();
// Initialize other runtime facilities
#if !V8_HOST_ARCH_ARM && V8_TARGET_ARCH_ARM
::assembler::arm::Simulator::Initialize();
#endif
{ // NOLINT
// Ensure that the thread has a valid stack guard. The v8::Locker object
// will ensure this too, but we don't have to use lockers if we are only
// using one thread.
ExecutionAccess lock;
StackGuard::InitThread(lock);
}
// Setup the object heap
ASSERT(!Heap::HasBeenSetup());
if (!Heap::Setup(create_heap_objects)) {
SetFatalError();
return false;
}
Bootstrapper::Initialize(create_heap_objects);
Builtins::Setup(create_heap_objects);
Top::Initialize();
if (FLAG_preemption) {
v8::Locker locker;
v8::Locker::StartPreemption(100);
}
#ifdef ENABLE_DEBUGGER_SUPPORT
Debug::Setup(create_heap_objects);
#endif
StubCache::Initialize(create_heap_objects);
// If we are deserializing, read the state into the now-empty heap.
if (des != NULL) {
des->Deserialize();
StubCache::Clear();
}
// Deserializing may put strange things in the root array's copy of the
// stack guard.
Heap::SetStackLimit(StackGuard::jslimit());
// Setup the CPU support. Must be done after heap setup and after
// any deserialization because we have to have the initial heap
// objects in place for creating the code object used for probing.
CPU::Setup();
OProfileAgent::Initialize();
return true;
}
void V8::SetFatalError() {
is_running_ = false;
has_fatal_error_ = true;
}
void V8::TearDown() {
if (!has_been_setup_ || has_been_disposed_) return;
OProfileAgent::TearDown();
if (FLAG_preemption) {
v8::Locker locker;
v8::Locker::StopPreemption();
}
Builtins::TearDown();
Bootstrapper::TearDown();
Top::TearDown();
Heap::TearDown();
Logger::TearDown();
is_running_ = false;
has_been_disposed_ = true;
}
uint32_t V8::Random() {
// Random number generator using George Marsaglia's MWC algorithm.
static uint32_t hi = 0;
static uint32_t lo = 0;
// Initialize seed using the system random(). If one of the seeds
// should ever become zero again, or if random() returns zero, we
// avoid getting stuck with zero bits in hi or lo by re-initializing
// them on demand.
if (hi == 0) hi = random();
if (lo == 0) lo = random();
// Mix the bits.
hi = 36969 * (hi & 0xFFFF) + (hi >> 16);
lo = 18273 * (lo & 0xFFFF) + (lo >> 16);
return (hi << 16) + (lo & 0xFFFF);
}
bool V8::IdleNotification(bool is_high_priority) {
// Returning true tells the caller that there is no need to call
// IdleNotification again.
if (!FLAG_use_idle_notification) return true;
// Ignore high priority instances of V8.
if (is_high_priority) return true;
// Tell the heap that it may want to adjust.
return Heap::IdleNotification();
}
Smi* V8::RandomPositiveSmi() {
uint32_t random = Random();
ASSERT(IsPowerOf2(Smi::kMaxValue + 1));
return Smi::FromInt(random & Smi::kMaxValue);
}
} } // namespace v8::internal
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